/*
 * jpeglib.h
 *
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * Modified 2002-2009 by Guido Vollbeding.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file defines the application interface for the JPEG library.
 * Most applications using the library need only include this file,
 * and perhaps jerror.h if they want to know the exact error codes.
 */

#ifndef JPEGLIB_H
#define JPEGLIB_H

/*
 * First we include the configuration files that record how this
 * installation of the JPEG library is set up.  jconfig.h can be
 * generated automatically for many systems.  jmorecfg.h contains
 * manual configuration options that most people need not worry about.
 */

#ifndef JCONFIG_INCLUDED    /* in case jinclude.h already did */
#include "jconfig.h"        /* widely used configuration options */
#endif
#include "jmorecfg.h"       /* seldom changed options */


#ifdef __cplusplus
#ifndef DONT_USE_EXTERN_C
extern "C" {
#endif
#endif

    /* Version ID for the JPEG library.
     * Might be useful for tests like "#if JPEG_LIB_VERSION >= 80".
     */

#define JPEG_LIB_VERSION  80    /* Version 8.0 */


    /* Various constants determining the sizes of things.
     * All of these are specified by the JPEG standard, so don't change them
     * if you want to be compatible.
     */

#define DCTSIZE         8   /* The basic DCT block is 8x8 samples */
#define DCTSIZE2        64  /* DCTSIZE squared; # of elements in a block */
#define NUM_QUANT_TBLS      4   /* Quantization tables are numbered 0..3 */
#define NUM_HUFF_TBLS       4   /* Huffman tables are numbered 0..3 */
#define NUM_ARITH_TBLS      16  /* Arith-coding tables are numbered 0..15 */
#define MAX_COMPS_IN_SCAN   4   /* JPEG limit on # of components in one scan */
#define MAX_SAMP_FACTOR     4   /* JPEG limit on sampling factors */
    /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
     * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
     * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
     * to handle it.  We even let you do this from the jconfig.h file.  However,
     * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
     * sometimes emits noncompliant files doesn't mean you should too.
     */
#define C_MAX_BLOCKS_IN_MCU   10 /* compressor's limit on blocks per MCU */
#ifndef D_MAX_BLOCKS_IN_MCU
#define D_MAX_BLOCKS_IN_MCU   10 /* decompressor's limit on blocks per MCU */
#endif


    /* Data structures for images (arrays of samples and of DCT coefficients).
     * On 80x86 machines, the image arrays are too big for near pointers,
     * but the pointer arrays can fit in near memory.
     */

    typedef JSAMPLE FAR *JSAMPROW;  /* ptr to one image row of pixel samples. */
    typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */
    typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */

    typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
    typedef JBLOCK FAR *JBLOCKROW;  /* pointer to one row of coefficient blocks */
    typedef JBLOCKROW *JBLOCKARRAY;     /* a 2-D array of coefficient blocks */
    typedef JBLOCKARRAY *JBLOCKIMAGE;   /* a 3-D array of coefficient blocks */

    typedef JCOEF FAR *JCOEFPTR;    /* useful in a couple of places */


    /* Types for JPEG compression parameters and working tables. */


    /* DCT coefficient quantization tables. */

    typedef struct {
        /* This array gives the coefficient quantizers in natural array order
         * (not the zigzag order in which they are stored in a JPEG DQT marker).
         * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
         */
        UINT16 quantval[DCTSIZE2];    /* quantization step for each coefficient */
        /* This field is used only during compression.  It's initialized FALSE when
         * the table is created, and set TRUE when it's been output to the file.
         * You could suppress output of a table by setting this to TRUE.
         * (See jpeg_suppress_tables for an example.)
         */
        boolean sent_table;       /* TRUE when table has been output */
    } JQUANT_TBL;


    /* Huffman coding tables. */

    typedef struct {
        /* These two fields directly represent the contents of a JPEG DHT marker */
        UINT8 bits[17];       /* bits[k] = # of symbols with codes of */
        /* length k bits; bits[0] is unused */
        UINT8 huffval[256];       /* The symbols, in order of incr code length */
        /* This field is used only during compression.  It's initialized FALSE when
         * the table is created, and set TRUE when it's been output to the file.
         * You could suppress output of a table by setting this to TRUE.
         * (See jpeg_suppress_tables for an example.)
         */
        boolean sent_table;       /* TRUE when table has been output */
    } JHUFF_TBL;


    /* Basic info about one component (color channel). */

    typedef struct {
        /* These values are fixed over the whole image. */
        /* For compression, they must be supplied by parameter setup; */
        /* for decompression, they are read from the SOF marker. */
        int component_id;     /* identifier for this component (0..255) */
        int component_index;      /* its index in SOF or cinfo->comp_info[] */
        int h_samp_factor;        /* horizontal sampling factor (1..4) */
        int v_samp_factor;        /* vertical sampling factor (1..4) */
        int quant_tbl_no;     /* quantization table selector (0..3) */
        /* These values may vary between scans. */
        /* For compression, they must be supplied by parameter setup; */
        /* for decompression, they are read from the SOS marker. */
        /* The decompressor output side may not use these variables. */
        int dc_tbl_no;        /* DC entropy table selector (0..3) */
        int ac_tbl_no;        /* AC entropy table selector (0..3) */

        /* Remaining fields should be treated as private by applications. */

        /* These values are computed during compression or decompression startup: */
        /* Component's size in DCT blocks.
         * Any dummy blocks added to complete an MCU are not counted; therefore
         * these values do not depend on whether a scan is interleaved or not.
         */
        JDIMENSION width_in_blocks;
        JDIMENSION height_in_blocks;
        /* Size of a DCT block in samples,
         * reflecting any scaling we choose to apply during the DCT step.
         * Values from 1 to 16 are supported.
         * Note that different components may receive different DCT scalings.
         */
        int DCT_h_scaled_size;
        int DCT_v_scaled_size;
        /* The downsampled dimensions are the component's actual, unpadded number
         * of samples at the main buffer (preprocessing/compression interface);
         * DCT scaling is included, so
         * downsampled_width = ceil(image_width * Hi/Hmax * DCT_h_scaled_size/DCTSIZE)
         * and similarly for height.
         */
        JDIMENSION downsampled_width;  /* actual width in samples */
        JDIMENSION downsampled_height; /* actual height in samples */
        /* This flag is used only for decompression.  In cases where some of the
         * components will be ignored (eg grayscale output from YCbCr image),
         * we can skip most computations for the unused components.
         */
        boolean component_needed; /* do we need the value of this component? */

        /* These values are computed before starting a scan of the component. */
        /* The decompressor output side may not use these variables. */
        int MCU_width;        /* number of blocks per MCU, horizontally */
        int MCU_height;       /* number of blocks per MCU, vertically */
        int MCU_blocks;       /* MCU_width * MCU_height */
        int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
        int last_col_width;       /* # of non-dummy blocks across in last MCU */
        int last_row_height;      /* # of non-dummy blocks down in last MCU */

        /* Saved quantization table for component; NULL if none yet saved.
         * See jdinput.c comments about the need for this information.
         * This field is currently used only for decompression.
         */
        JQUANT_TBL *quant_table;

        /* Private per-component storage for DCT or IDCT subsystem. */
        void *dct_table;
    } jpeg_component_info;


    /* The script for encoding a multiple-scan file is an array of these: */

    typedef struct {
        int comps_in_scan;        /* number of components encoded in this scan */
        int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
        int Ss, Se;           /* progressive JPEG spectral selection parms */
        int Ah, Al;           /* progressive JPEG successive approx. parms */
    } jpeg_scan_info;

    /* The decompressor can save APPn and COM markers in a list of these: */

    typedef struct jpeg_marker_struct FAR *jpeg_saved_marker_ptr;

    struct jpeg_marker_struct {
        jpeg_saved_marker_ptr next;   /* next in list, or NULL */
        UINT8 marker;         /* marker code: JPEG_COM, or JPEG_APP0+n */
        unsigned int original_length; /* # bytes of data in the file */
        unsigned int data_length; /* # bytes of data saved at data[] */
        JOCTET FAR *data;         /* the data contained in the marker */
        /* the marker length word is not counted in data_length or original_length */
    };

    /* Known color spaces. */

    typedef enum {
        JCS_UNKNOWN,        /* error/unspecified */
        JCS_GRAYSCALE,      /* monochrome */
        JCS_RGB,        /* red/green/blue */
        JCS_YCbCr,      /* Y/Cb/Cr (also known as YUV) */
        JCS_CMYK,       /* C/M/Y/K */
        JCS_YCCK        /* Y/Cb/Cr/K */
    } J_COLOR_SPACE;

    /* DCT/IDCT algorithm options. */

    typedef enum {
        JDCT_ISLOW,     /* slow but accurate integer algorithm */
        JDCT_IFAST,     /* faster, less accurate integer method */
        JDCT_FLOAT      /* floating-point: accurate, fast on fast HW */
    } J_DCT_METHOD;

#ifndef JDCT_DEFAULT        /* may be overridden in jconfig.h */
#define JDCT_DEFAULT  JDCT_ISLOW
#endif
#ifndef JDCT_FASTEST        /* may be overridden in jconfig.h */
#define JDCT_FASTEST  JDCT_IFAST
#endif

    /* Dithering options for decompression. */

    typedef enum {
        JDITHER_NONE,       /* no dithering */
        JDITHER_ORDERED,    /* simple ordered dither */
        JDITHER_FS      /* Floyd-Steinberg error diffusion dither */
    } J_DITHER_MODE;


    /* Common fields between JPEG compression and decompression master structs. */

#define jpeg_common_fields \
    struct jpeg_error_mgr * err;  /* Error handler module */\
    struct jpeg_memory_mgr * mem; /* Memory manager module */\
    struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
    void * client_data;       /* Available for use by application */\
    boolean is_decompressor;  /* So common code can tell which is which */\
    int global_state      /* For checking call sequence validity */

    /* Routines that are to be used by both halves of the library are declared
     * to receive a pointer to this structure.  There are no actual instances of
     * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
     */
    struct jpeg_common_struct {
        jpeg_common_fields;       /* Fields common to both master struct types */
        /* Additional fields follow in an actual jpeg_compress_struct or
         * jpeg_decompress_struct.  All three structs must agree on these
         * initial fields!  (This would be a lot cleaner in C++.)
         */
    };

    typedef struct jpeg_common_struct *j_common_ptr;
    typedef struct jpeg_compress_struct *j_compress_ptr;
    typedef struct jpeg_decompress_struct *j_decompress_ptr;


    /* Master record for a compression instance */

    struct jpeg_compress_struct {
        jpeg_common_fields;       /* Fields shared with jpeg_decompress_struct */

        /* Destination for compressed data */
        struct jpeg_destination_mgr *dest;

        /* Description of source image --- these fields must be filled in by
         * outer application before starting compression.  in_color_space must
         * be correct before you can even call jpeg_set_defaults().
         */

        JDIMENSION image_width;   /* input image width */
        JDIMENSION image_height;  /* input image height */
        int input_components;     /* # of color components in input image */
        J_COLOR_SPACE in_color_space; /* colorspace of input image */

        double input_gamma;       /* image gamma of input image */

        /* Compression parameters --- these fields must be set before calling
         * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
         * initialize everything to reasonable defaults, then changing anything
         * the application specifically wants to change.  That way you won't get
         * burnt when new parameters are added.  Also note that there are several
         * helper routines to simplify changing parameters.
         */

        unsigned int scale_num, scale_denom; /* fraction by which to scale image */

        JDIMENSION jpeg_width;    /* scaled JPEG image width */
        JDIMENSION jpeg_height;   /* scaled JPEG image height */
        /* Dimensions of actual JPEG image that will be written to file,
         * derived from input dimensions by scaling factors above.
         * These fields are computed by jpeg_start_compress().
         * You can also use jpeg_calc_jpeg_dimensions() to determine these values
         * in advance of calling jpeg_start_compress().
         */

        int data_precision;       /* bits of precision in image data */

        int num_components;       /* # of color components in JPEG image */
        J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */

        jpeg_component_info *comp_info;
        /* comp_info[i] describes component that appears i'th in SOF */

        JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
        int q_scale_factor[NUM_QUANT_TBLS];
        /* ptrs to coefficient quantization tables, or NULL if not defined,
         * and corresponding scale factors (percentage, initialized 100).
         */

        JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
        JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
        /* ptrs to Huffman coding tables, or NULL if not defined */

        UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
        UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
        UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */

        int num_scans;        /* # of entries in scan_info array */
        const jpeg_scan_info *scan_info;  /* script for multi-scan file, or NULL */
        /* The default value of scan_info is NULL, which causes a single-scan
         * sequential JPEG file to be emitted.  To create a multi-scan file,
         * set num_scans and scan_info to point to an array of scan definitions.
         */

        boolean raw_data_in;      /* TRUE=caller supplies downsampled data */
        boolean arith_code;       /* TRUE=arithmetic coding, FALSE=Huffman */
        boolean optimize_coding;  /* TRUE=optimize entropy encoding parms */
        boolean CCIR601_sampling; /* TRUE=first samples are cosited */
        boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
        int smoothing_factor;     /* 1..100, or 0 for no input smoothing */
        J_DCT_METHOD dct_method;  /* DCT algorithm selector */

        /* The restart interval can be specified in absolute MCUs by setting
         * restart_interval, or in MCU rows by setting restart_in_rows
         * (in which case the correct restart_interval will be figured
         * for each scan).
         */
        unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
        int restart_in_rows;      /* if > 0, MCU rows per restart interval */

        /* Parameters controlling emission of special markers. */

        boolean write_JFIF_header;    /* should a JFIF marker be written? */
        UINT8 JFIF_major_version; /* What to write for the JFIF version number */
        UINT8 JFIF_minor_version;
        /* These three values are not used by the JPEG code, merely copied */
        /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
        /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
        /* ratio is defined by X_density/Y_density even when density_unit=0. */
        UINT8 density_unit;       /* JFIF code for pixel size units */
        UINT16 X_density;     /* Horizontal pixel density */
        UINT16 Y_density;     /* Vertical pixel density */
        boolean write_Adobe_marker;   /* should an Adobe marker be written? */

        /* State variable: index of next scanline to be written to
         * jpeg_write_scanlines().  Application may use this to control its
         * processing loop, e.g., "while (next_scanline < image_height)".
         */

        JDIMENSION next_scanline; /* 0 .. image_height-1  */

        /* Remaining fields are known throughout compressor, but generally
         * should not be touched by a surrounding application.
         */

        /*
         * These fields are computed during compression startup
         */
        boolean progressive_mode; /* TRUE if scan script uses progressive mode */
        int max_h_samp_factor;    /* largest h_samp_factor */
        int max_v_samp_factor;    /* largest v_samp_factor */

        int min_DCT_h_scaled_size;    /* smallest DCT_h_scaled_size of any component */
        int min_DCT_v_scaled_size;    /* smallest DCT_v_scaled_size of any component */

        JDIMENSION total_iMCU_rows;   /* # of iMCU rows to be input to coef ctlr */
        /* The coefficient controller receives data in units of MCU rows as defined
         * for fully interleaved scans (whether the JPEG file is interleaved or not).
         * There are v_samp_factor * DCTSIZE sample rows of each component in an
         * "iMCU" (interleaved MCU) row.
         */

        /*
         * These fields are valid during any one scan.
         * They describe the components and MCUs actually appearing in the scan.
         */
        int comps_in_scan;        /* # of JPEG components in this scan */
        jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
        /* *cur_comp_info[i] describes component that appears i'th in SOS */

        JDIMENSION MCUs_per_row;  /* # of MCUs across the image */
        JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */

        int blocks_in_MCU;        /* # of DCT blocks per MCU */
        int MCU_membership[C_MAX_BLOCKS_IN_MCU];
        /* MCU_membership[i] is index in cur_comp_info of component owning */
        /* i'th block in an MCU */

        int Ss, Se, Ah, Al;       /* progressive JPEG parameters for scan */

        int block_size;       /* the basic DCT block size: 1..16 */
        const int *natural_order;     /* natural-order position array */
        int lim_Se;           /* min( Se, DCTSIZE2-1 ) */

        /*
         * Links to compression subobjects (methods and private variables of modules)
         */
        struct jpeg_comp_master *master;
        struct jpeg_c_main_controller *main;
        struct jpeg_c_prep_controller *prep;
        struct jpeg_c_coef_controller *coef;
        struct jpeg_marker_writer *marker;
        struct jpeg_color_converter *cconvert;
        struct jpeg_downsampler *downsample;
        struct jpeg_forward_dct *fdct;
        struct jpeg_entropy_encoder *entropy;
        jpeg_scan_info *script_space;  /* workspace for jpeg_simple_progression */
        int script_space_size;
    };


    /* Master record for a decompression instance */

    struct jpeg_decompress_struct {
        jpeg_common_fields;       /* Fields shared with jpeg_compress_struct */

        /* Source of compressed data */
        struct jpeg_source_mgr *src;

        /* Basic description of image --- filled in by jpeg_read_header(). */
        /* Application may inspect these values to decide how to process image. */

        JDIMENSION image_width;   /* nominal image width (from SOF marker) */
        JDIMENSION image_height;  /* nominal image height */
        int num_components;       /* # of color components in JPEG image */
        J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */

        /* Decompression processing parameters --- these fields must be set before
         * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
         * them to default values.
         */

        J_COLOR_SPACE out_color_space; /* colorspace for output */

        unsigned int scale_num, scale_denom; /* fraction by which to scale image */

        double output_gamma;      /* image gamma wanted in output */

        boolean buffered_image;   /* TRUE=multiple output passes */
        boolean raw_data_out;     /* TRUE=downsampled data wanted */

        J_DCT_METHOD dct_method;  /* IDCT algorithm selector */
        boolean do_fancy_upsampling;  /* TRUE=apply fancy upsampling */
        boolean do_block_smoothing;   /* TRUE=apply interblock smoothing */

        boolean quantize_colors;  /* TRUE=colormapped output wanted */
        /* the following are ignored if not quantize_colors: */
        J_DITHER_MODE dither_mode;    /* type of color dithering to use */
        boolean two_pass_quantize;    /* TRUE=use two-pass color quantization */
        int desired_number_of_colors; /* max # colors to use in created colormap */
        /* these are significant only in buffered-image mode: */
        boolean enable_1pass_quant;   /* enable future use of 1-pass quantizer */
        boolean enable_external_quant;/* enable future use of external colormap */
        boolean enable_2pass_quant;   /* enable future use of 2-pass quantizer */

        /* Description of actual output image that will be returned to application.
         * These fields are computed by jpeg_start_decompress().
         * You can also use jpeg_calc_output_dimensions() to determine these values
         * in advance of calling jpeg_start_decompress().
         */

        JDIMENSION output_width;  /* scaled image width */
        JDIMENSION output_height; /* scaled image height */
        int out_color_components; /* # of color components in out_color_space */
        int output_components;    /* # of color components returned */
        /* output_components is 1 (a colormap index) when quantizing colors;
         * otherwise it equals out_color_components.
         */
        int rec_outbuf_height;    /* min recommended height of scanline buffer */
        /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
         * high, space and time will be wasted due to unnecessary data copying.
         * Usually rec_outbuf_height will be 1 or 2, at most 4.
         */

        /* When quantizing colors, the output colormap is described by these fields.
         * The application can supply a colormap by setting colormap non-NULL before
         * calling jpeg_start_decompress; otherwise a colormap is created during
         * jpeg_start_decompress or jpeg_start_output.
         * The map has out_color_components rows and actual_number_of_colors columns.
         */
        int actual_number_of_colors;  /* number of entries in use */
        JSAMPARRAY colormap;      /* The color map as a 2-D pixel array */

        /* State variables: these variables indicate the progress of decompression.
         * The application may examine these but must not modify them.
         */

        /* Row index of next scanline to be read from jpeg_read_scanlines().
         * Application may use this to control its processing loop, e.g.,
         * "while (output_scanline < output_height)".
         */
        JDIMENSION output_scanline;   /* 0 .. output_height-1  */

        /* Current input scan number and number of iMCU rows completed in scan.
         * These indicate the progress of the decompressor input side.
         */
        int input_scan_number;    /* Number of SOS markers seen so far */
        JDIMENSION input_iMCU_row;    /* Number of iMCU rows completed */

        /* The "output scan number" is the notional scan being displayed by the
         * output side.  The decompressor will not allow output scan/row number
         * to get ahead of input scan/row, but it can fall arbitrarily far behind.
         */
        int output_scan_number;   /* Nominal scan number being displayed */
        JDIMENSION output_iMCU_row;   /* Number of iMCU rows read */

        /* Current progression status.  coef_bits[c][i] indicates the precision
         * with which component c's DCT coefficient i (in zigzag order) is known.
         * It is -1 when no data has yet been received, otherwise it is the point
         * transform (shift) value for the most recent scan of the coefficient
         * (thus, 0 at completion of the progression).
         * This pointer is NULL when reading a non-progressive file.
         */
        int (*coef_bits)[DCTSIZE2];   /* -1 or current Al value for each coef */

        /* Internal JPEG parameters --- the application usually need not look at
         * these fields.  Note that the decompressor output side may not use
         * any parameters that can change between scans.
         */

        /* Quantization and Huffman tables are carried forward across input
         * datastreams when processing abbreviated JPEG datastreams.
         */

        JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
        /* ptrs to coefficient quantization tables, or NULL if not defined */

        JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
        JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
        /* ptrs to Huffman coding tables, or NULL if not defined */

        /* These parameters are never carried across datastreams, since they
         * are given in SOF/SOS markers or defined to be reset by SOI.
         */

        int data_precision;       /* bits of precision in image data */

        jpeg_component_info *comp_info;
        /* comp_info[i] describes component that appears i'th in SOF */

        boolean is_baseline;      /* TRUE if Baseline SOF0 encountered */
        boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
        boolean arith_code;       /* TRUE=arithmetic coding, FALSE=Huffman */

        UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
        UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
        UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */

        unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */

        /* These fields record data obtained from optional markers recognized by
         * the JPEG library.
         */
        boolean saw_JFIF_marker;  /* TRUE iff a JFIF APP0 marker was found */
        /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
        UINT8 JFIF_major_version; /* JFIF version number */
        UINT8 JFIF_minor_version;
        UINT8 density_unit;       /* JFIF code for pixel size units */
        UINT16 X_density;     /* Horizontal pixel density */
        UINT16 Y_density;     /* Vertical pixel density */
        boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
        UINT8 Adobe_transform;    /* Color transform code from Adobe marker */

        boolean CCIR601_sampling; /* TRUE=first samples are cosited */

        /* Aside from the specific data retained from APPn markers known to the
         * library, the uninterpreted contents of any or all APPn and COM markers
         * can be saved in a list for examination by the application.
         */
        jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */

        /* Remaining fields are known throughout decompressor, but generally
         * should not be touched by a surrounding application.
         */

        /*
         * These fields are computed during decompression startup
         */
        int max_h_samp_factor;    /* largest h_samp_factor */
        int max_v_samp_factor;    /* largest v_samp_factor */

        int min_DCT_h_scaled_size;    /* smallest DCT_h_scaled_size of any component */
        int min_DCT_v_scaled_size;    /* smallest DCT_v_scaled_size of any component */

        JDIMENSION total_iMCU_rows;   /* # of iMCU rows in image */
        /* The coefficient controller's input and output progress is measured in
         * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
         * in fully interleaved JPEG scans, but are used whether the scan is
         * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
         * rows of each component.  Therefore, the IDCT output contains
         * v_samp_factor*DCT_v_scaled_size sample rows of a component per iMCU row.
         */

        JSAMPLE *sample_range_limit;  /* table for fast range-limiting */

        /*
         * These fields are valid during any one scan.
         * They describe the components and MCUs actually appearing in the scan.
         * Note that the decompressor output side must not use these fields.
         */
        int comps_in_scan;        /* # of JPEG components in this scan */
        jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
        /* *cur_comp_info[i] describes component that appears i'th in SOS */

        JDIMENSION MCUs_per_row;  /* # of MCUs across the image */
        JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */

        int blocks_in_MCU;        /* # of DCT blocks per MCU */
        int MCU_membership[D_MAX_BLOCKS_IN_MCU];
        /* MCU_membership[i] is index in cur_comp_info of component owning */
        /* i'th block in an MCU */

        int Ss, Se, Ah, Al;       /* progressive JPEG parameters for scan */

        /* These fields are derived from Se of first SOS marker.
         */
        int block_size;       /* the basic DCT block size: 1..16 */
        const int *natural_order;  /* natural-order position array for entropy decode */
        int lim_Se;           /* min( Se, DCTSIZE2-1 ) for entropy decode */

        /* This field is shared between entropy decoder and marker parser.
         * It is either zero or the code of a JPEG marker that has been
         * read from the data source, but has not yet been processed.
         */
        int unread_marker;

        /*
         * Links to decompression subobjects (methods, private variables of modules)
         */
        struct jpeg_decomp_master *master;
        struct jpeg_d_main_controller *main;
        struct jpeg_d_coef_controller *coef;
        struct jpeg_d_post_controller *post;
        struct jpeg_input_controller *inputctl;
        struct jpeg_marker_reader *marker;
        struct jpeg_entropy_decoder *entropy;
        struct jpeg_inverse_dct *idct;
        struct jpeg_upsampler *upsample;
        struct jpeg_color_deconverter *cconvert;
        struct jpeg_color_quantizer *cquantize;
    };


    /* "Object" declarations for JPEG modules that may be supplied or called
     * directly by the surrounding application.
     * As with all objects in the JPEG library, these structs only define the
     * publicly visible methods and state variables of a module.  Additional
     * private fields may exist after the public ones.
     */


    /* Error handler object */

    struct jpeg_error_mgr {
        /* Error exit handler: does not return to caller */
        JMETHOD(void, error_exit, (j_common_ptr cinfo));
        /* Conditionally emit a trace or warning message */
        JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
        /* Routine that actually outputs a trace or error message */
        JMETHOD(void, output_message, (j_common_ptr cinfo));
        /* Format a message string for the most recent JPEG error or message */
        JMETHOD(void, format_message, (j_common_ptr cinfo, char *buffer));
#define JMSG_LENGTH_MAX  200    /* recommended size of format_message buffer */
        /* Reset error state variables at start of a new image */
        JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));

        /* The message ID code and any parameters are saved here.
         * A message can have one string parameter or up to 8 int parameters.
         */
        int msg_code;
#define JMSG_STR_PARM_MAX  80
        union {
            int i[8];
            char s[JMSG_STR_PARM_MAX];
        } msg_parm;

        /* Standard state variables for error facility */

        int trace_level;      /* max msg_level that will be displayed */

        /* For recoverable corrupt-data errors, we emit a warning message,
         * but keep going unless emit_message chooses to abort.  emit_message
         * should count warnings in num_warnings.  The surrounding application
         * can check for bad data by seeing if num_warnings is nonzero at the
         * end of processing.
         */
        long num_warnings;        /* number of corrupt-data warnings */

        /* These fields point to the table(s) of error message strings.
         * An application can change the table pointer to switch to a different
         * message list (typically, to change the language in which errors are
         * reported).  Some applications may wish to add additional error codes
         * that will be handled by the JPEG library error mechanism; the second
         * table pointer is used for this purpose.
         *
         * First table includes all errors generated by JPEG library itself.
         * Error code 0 is reserved for a "no such error string" message.
         */
        const char *const *jpeg_message_table;   /* Library errors */
        int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
        /* Second table can be added by application (see cjpeg/djpeg for example).
         * It contains strings numbered first_addon_message..last_addon_message.
         */
        const char *const *addon_message_table;   /* Non-library errors */
        int first_addon_message;  /* code for first string in addon table */
        int last_addon_message;   /* code for last string in addon table */
    };


    /* Progress monitor object */

    struct jpeg_progress_mgr {
        JMETHOD(void, progress_monitor, (j_common_ptr cinfo));

        long pass_counter;        /* work units completed in this pass */
        long pass_limit;      /* total number of work units in this pass */
        int completed_passes;     /* passes completed so far */
        int total_passes;     /* total number of passes expected */
    };


    /* Data destination object for compression */

    struct jpeg_destination_mgr {
        JOCTET *next_output_byte;     /* => next byte to write in buffer */
        size_t free_in_buffer;    /* # of byte spaces remaining in buffer */

        JMETHOD(void, init_destination, (j_compress_ptr cinfo));
        JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
        JMETHOD(void, term_destination, (j_compress_ptr cinfo));
    };


    /* Data source object for decompression */

    struct jpeg_source_mgr {
        const JOCTET *next_input_byte;  /* => next byte to read from buffer */
        size_t bytes_in_buffer;   /* # of bytes remaining in buffer */

        JMETHOD(void, init_source, (j_decompress_ptr cinfo));
        JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
        JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
        JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
        JMETHOD(void, term_source, (j_decompress_ptr cinfo));
    };


    /* Memory manager object.
     * Allocates "small" objects (a few K total), "large" objects (tens of K),
     * and "really big" objects (virtual arrays with backing store if needed).
     * The memory manager does not allow individual objects to be freed; rather,
     * each created object is assigned to a pool, and whole pools can be freed
     * at once.  This is faster and more convenient than remembering exactly what
     * to free, especially where malloc()/free() are not too speedy.
     * NB: alloc routines never return NULL.  They exit to error_exit if not
     * successful.
     */

#define JPOOL_PERMANENT 0   /* lasts until master record is destroyed */
#define JPOOL_IMAGE 1   /* lasts until done with image/datastream */
#define JPOOL_NUMPOOLS  2

    typedef struct jvirt_sarray_control *jvirt_sarray_ptr;
    typedef struct jvirt_barray_control *jvirt_barray_ptr;


    struct jpeg_memory_mgr {
        /* Method pointers */
        JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
                                      size_t sizeofobject));
        JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
                                          size_t sizeofobject));
        JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
                                           JDIMENSION samplesperrow,
                                           JDIMENSION numrows));
        JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
                                            JDIMENSION blocksperrow,
                                            JDIMENSION numrows));
        JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
                                                        int pool_id,
                                                        boolean pre_zero,
                                                        JDIMENSION samplesperrow,
                                                        JDIMENSION numrows,
                                                        JDIMENSION maxaccess));
        JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
                                                        int pool_id,
                                                        boolean pre_zero,
                                                        JDIMENSION blocksperrow,
                                                        JDIMENSION numrows,
                                                        JDIMENSION maxaccess));
        JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
        JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
                                                 jvirt_sarray_ptr ptr,
                                                 JDIMENSION start_row,
                                                 JDIMENSION num_rows,
                                                 boolean writable));
        JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
                                                  jvirt_barray_ptr ptr,
                                                  JDIMENSION start_row,
                                                  JDIMENSION num_rows,
                                                  boolean writable));
        JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
        JMETHOD(void, self_destruct, (j_common_ptr cinfo));

        /* Limit on memory allocation for this JPEG object.  (Note that this is
         * merely advisory, not a guaranteed maximum; it only affects the space
         * used for virtual-array buffers.)  May be changed by outer application
         * after creating the JPEG object.
         */
        long max_memory_to_use;

        /* Maximum allocation request accepted by alloc_large. */
        long max_alloc_chunk;
    };


    /* Routine signature for application-supplied marker processing methods.
     * Need not pass marker code since it is stored in cinfo->unread_marker.
     */
    typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));


    /* Declarations for routines called by application.
     * The JPP macro hides prototype parameters from compilers that can't cope.
     * Note JPP requires double parentheses.
     */

#ifdef HAVE_PROTOTYPES
#define JPP(arglist)    arglist
#else
#define JPP(arglist)    ()
#endif


    /* Short forms of external names for systems with brain-damaged linkers.
     * We shorten external names to be unique in the first six letters, which
     * is good enough for all known systems.
     * (If your compiler itself needs names to be unique in less than 15
     * characters, you are out of luck.  Get a better compiler.)
     */

#ifdef NEED_SHORT_EXTERNAL_NAMES
#define jpeg_std_error      jStdError
#define jpeg_CreateCompress jCreaCompress
#define jpeg_CreateDecompress   jCreaDecompress
#define jpeg_destroy_compress   jDestCompress
#define jpeg_destroy_decompress jDestDecompress
#define jpeg_stdio_dest     jStdDest
#define jpeg_stdio_src      jStdSrc
#define jpeg_mem_dest       jMemDest
#define jpeg_mem_src        jMemSrc
#define jpeg_set_defaults   jSetDefaults
#define jpeg_set_colorspace jSetColorspace
#define jpeg_default_colorspace jDefColorspace
#define jpeg_set_quality    jSetQuality
#define jpeg_set_linear_quality jSetLQuality
#define jpeg_default_qtables    jDefQTables
#define jpeg_add_quant_table    jAddQuantTable
#define jpeg_quality_scaling    jQualityScaling
#define jpeg_simple_progression jSimProgress
#define jpeg_suppress_tables    jSuppressTables
#define jpeg_alloc_quant_table  jAlcQTable
#define jpeg_alloc_huff_table   jAlcHTable
#define jpeg_start_compress jStrtCompress
#define jpeg_write_scanlines    jWrtScanlines
#define jpeg_finish_compress    jFinCompress
#define jpeg_calc_jpeg_dimensions   jCjpegDimensions
#define jpeg_write_raw_data jWrtRawData
#define jpeg_write_marker   jWrtMarker
#define jpeg_write_m_header jWrtMHeader
#define jpeg_write_m_byte   jWrtMByte
#define jpeg_write_tables   jWrtTables
#define jpeg_read_header    jReadHeader
#define jpeg_start_decompress   jStrtDecompress
#define jpeg_read_scanlines jReadScanlines
#define jpeg_finish_decompress  jFinDecompress
#define jpeg_read_raw_data  jReadRawData
#define jpeg_has_multiple_scans jHasMultScn
#define jpeg_start_output   jStrtOutput
#define jpeg_finish_output  jFinOutput
#define jpeg_input_complete jInComplete
#define jpeg_new_colormap   jNewCMap
#define jpeg_consume_input  jConsumeInput
#define jpeg_core_output_dimensions jCoreDimensions
#define jpeg_calc_output_dimensions jCalcDimensions
#define jpeg_save_markers   jSaveMarkers
#define jpeg_set_marker_processor   jSetMarker
#define jpeg_read_coefficients  jReadCoefs
#define jpeg_write_coefficients jWrtCoefs
#define jpeg_copy_critical_parameters   jCopyCrit
#define jpeg_abort_compress jAbrtCompress
#define jpeg_abort_decompress   jAbrtDecompress
#define jpeg_abort      jAbort
#define jpeg_destroy        jDestroy
#define jpeg_resync_to_restart  jResyncRestart
#endif /* NEED_SHORT_EXTERNAL_NAMES */


    /* Default error-management setup */
    EXTERN(struct jpeg_error_mgr *) jpeg_std_error
    JPP((struct jpeg_error_mgr *err));

    /* Initialization of JPEG compression objects.
     * jpeg_create_compress() and jpeg_create_decompress() are the exported
     * names that applications should call.  These expand to calls on
     * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
     * passed for version mismatch checking.
     * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
     */
#define jpeg_create_compress(cinfo) \
    jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
                        (size_t) sizeof(struct jpeg_compress_struct))
#define jpeg_create_decompress(cinfo) \
    jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
                          (size_t) sizeof(struct jpeg_decompress_struct))
    EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
                                          int version, size_t structsize));
    EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
                                            int version, size_t structsize));
    /* Destruction of JPEG compression objects */
    EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
    EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));

    /* Standard data source and destination managers: stdio streams. */
    /* Caller is responsible for opening the file before and closing after. */
    EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE *outfile));
    EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE *infile));

    /* Data source and destination managers: memory buffers. */
    EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
                                    unsigned char **outbuffer,
                                    unsigned long *outsize));
    EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
                                   unsigned char *inbuffer,
                                   unsigned long insize));

    /* Default parameter setup for compression */
    EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
    /* Compression parameter setup aids */
    EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
                                          J_COLOR_SPACE colorspace));
    EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
    EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
                                       boolean force_baseline));
    EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
                                              int scale_factor,
                                              boolean force_baseline));
    EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
                                           boolean force_baseline));
    EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
                                           const unsigned int *basic_table,
                                           int scale_factor,
                                           boolean force_baseline));
    EXTERN(int) jpeg_quality_scaling JPP((int quality));
    EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
    EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
                                           boolean suppress));
    EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
    EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));

    /* Main entry points for compression */
    EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
                                          boolean write_all_tables));
    EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
                                                 JSAMPARRAY scanlines,
                                                 JDIMENSION num_lines));
    EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));

    /* Precalculate JPEG dimensions for current compression parameters. */
    EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));

    /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
    EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
                                                JSAMPIMAGE data,
                                                JDIMENSION num_lines));

    /* Write a special marker.  See libjpeg.txt concerning safe usage. */
    EXTERN(void) jpeg_write_marker
    JPP((j_compress_ptr cinfo, int marker,
         const JOCTET *dataptr, unsigned int datalen));
    /* Same, but piecemeal. */
    EXTERN(void) jpeg_write_m_header
    JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
    EXTERN(void) jpeg_write_m_byte
    JPP((j_compress_ptr cinfo, int val));

    /* Alternate compression function: just write an abbreviated table file */
    EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));

    /* Decompression startup: read start of JPEG datastream to see what's there */
    EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
                                      boolean require_image));
    /* Return value is one of: */
#define JPEG_SUSPENDED      0 /* Suspended due to lack of input data */
#define JPEG_HEADER_OK      1 /* Found valid image datastream */
#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
    /* If you pass require_image = TRUE (normal case), you need not check for
     * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
     * JPEG_SUSPENDED is only possible if you use a data source module that can
     * give a suspension return (the stdio source module doesn't).
     */

    /* Main entry points for decompression */
    EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
    EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
                                                JSAMPARRAY scanlines,
                                                JDIMENSION max_lines));
    EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));

    /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
    EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
                                               JSAMPIMAGE data,
                                               JDIMENSION max_lines));

    /* Additional entry points for buffered-image mode. */
    EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
    EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
                                           int scan_number));
    EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
    EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
    EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
    EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
    /* Return value is one of: */
    /* #define JPEG_SUSPENDED   0    Suspended due to lack of input data */
#define JPEG_REACHED_SOS    1 /* Reached start of new scan */
#define JPEG_REACHED_EOI    2 /* Reached end of image */
#define JPEG_ROW_COMPLETED  3 /* Completed one iMCU row */
#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */

    /* Precalculate output dimensions for current decompression parameters. */
    EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
    EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));

    /* Control saving of COM and APPn markers into marker_list. */
    EXTERN(void) jpeg_save_markers
    JPP((j_decompress_ptr cinfo, int marker_code,
         unsigned int length_limit));

    /* Install a special processing method for COM or APPn markers. */
    EXTERN(void) jpeg_set_marker_processor
    JPP((j_decompress_ptr cinfo, int marker_code,
         jpeg_marker_parser_method routine));

    /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
    EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
    EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
                                              jvirt_barray_ptr *coef_arrays));
    EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
                                                    j_compress_ptr dstinfo));

    /* If you choose to abort compression or decompression before completing
     * jpeg_finish_(de)compress, then you need to clean up to release memory,
     * temporary files, etc.  You can just call jpeg_destroy_(de)compress
     * if you're done with the JPEG object, but if you want to clean it up and
     * reuse it, call this:
     */
    EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
    EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));

    /* Generic versions of jpeg_abort and jpeg_destroy that work on either
     * flavor of JPEG object.  These may be more convenient in some places.
     */
    EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
    EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));

    /* Default restart-marker-resync procedure for use by data source modules */
    EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
                                                int desired));


    /* These marker codes are exported since applications and data source modules
     * are likely to want to use them.
     */

#define JPEG_RST0   0xD0    /* RST0 marker code */
#define JPEG_EOI    0xD9    /* EOI marker code */
#define JPEG_APP0   0xE0    /* APP0 marker code */
#define JPEG_COM    0xFE    /* COM marker code */


    /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
     * for structure definitions that are never filled in, keep it quiet by
     * supplying dummy definitions for the various substructures.
     */

#ifdef INCOMPLETE_TYPES_BROKEN
#ifndef JPEG_INTERNALS      /* will be defined in jpegint.h */
    struct jvirt_sarray_control { long dummy; };
    struct jvirt_barray_control { long dummy; };
    struct jpeg_comp_master { long dummy; };
    struct jpeg_c_main_controller { long dummy; };
    struct jpeg_c_prep_controller { long dummy; };
    struct jpeg_c_coef_controller { long dummy; };
    struct jpeg_marker_writer { long dummy; };
    struct jpeg_color_converter { long dummy; };
    struct jpeg_downsampler { long dummy; };
    struct jpeg_forward_dct { long dummy; };
    struct jpeg_entropy_encoder { long dummy; };
    struct jpeg_decomp_master { long dummy; };
    struct jpeg_d_main_controller { long dummy; };
    struct jpeg_d_coef_controller { long dummy; };
    struct jpeg_d_post_controller { long dummy; };
    struct jpeg_input_controller { long dummy; };
    struct jpeg_marker_reader { long dummy; };
    struct jpeg_entropy_decoder { long dummy; };
    struct jpeg_inverse_dct { long dummy; };
    struct jpeg_upsampler { long dummy; };
    struct jpeg_color_deconverter { long dummy; };
    struct jpeg_color_quantizer { long dummy; };
#endif /* JPEG_INTERNALS */
#endif /* INCOMPLETE_TYPES_BROKEN */


    /*
     * The JPEG library modules define JPEG_INTERNALS before including this file.
     * The internal structure declarations are read only when that is true.
     * Applications using the library should not include jpegint.h, but may wish
     * to include jerror.h.
     */

#ifdef JPEG_INTERNALS
#include "jpegint.h"        /* fetch private declarations */
#include "jerror.h"     /* fetch error codes too */
#endif

#ifdef __cplusplus
#ifndef DONT_USE_EXTERN_C
}
#endif
#endif

#endif /* JPEGLIB_H */
